1*4d3c95f5SJorgen Lundman /* 2*4d3c95f5SJorgen Lundman * GRUB -- GRand Unified Bootloader 3*4d3c95f5SJorgen Lundman * Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc. 4*4d3c95f5SJorgen Lundman * 5*4d3c95f5SJorgen Lundman * This program is free software; you can redistribute it and/or modify 6*4d3c95f5SJorgen Lundman * it under the terms of the GNU General Public License as published by 7*4d3c95f5SJorgen Lundman * the Free Software Foundation; either version 2 of the License, or 8*4d3c95f5SJorgen Lundman * (at your option) any later version. 9*4d3c95f5SJorgen Lundman * 10*4d3c95f5SJorgen Lundman * This program is distributed in the hope that it will be useful, 11*4d3c95f5SJorgen Lundman * but WITHOUT ANY WARRANTY; without even the implied warranty of 12*4d3c95f5SJorgen Lundman * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13*4d3c95f5SJorgen Lundman * GNU General Public License for more details. 14*4d3c95f5SJorgen Lundman * 15*4d3c95f5SJorgen Lundman * You should have received a copy of the GNU General Public License 16*4d3c95f5SJorgen Lundman * along with this program; if not, write to the Free Software 17*4d3c95f5SJorgen Lundman * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 18*4d3c95f5SJorgen Lundman */ 19*4d3c95f5SJorgen Lundman /* 20*4d3c95f5SJorgen Lundman * Copyright 2010 Sun Microsystems, Inc. All rights reserved. 21*4d3c95f5SJorgen Lundman * Use is subject to license terms. 22*4d3c95f5SJorgen Lundman */ 23*4d3c95f5SJorgen Lundman 24*4d3c95f5SJorgen Lundman #ifndef _SYS_DNODE_H 25*4d3c95f5SJorgen Lundman #define _SYS_DNODE_H 26*4d3c95f5SJorgen Lundman 27*4d3c95f5SJorgen Lundman #include <zfs/spa.h> 28*4d3c95f5SJorgen Lundman 29*4d3c95f5SJorgen Lundman /* 30*4d3c95f5SJorgen Lundman * Fixed constants. 31*4d3c95f5SJorgen Lundman */ 32*4d3c95f5SJorgen Lundman #define DNODE_SHIFT 9 /* 512 bytes */ 33*4d3c95f5SJorgen Lundman #define DN_MIN_INDBLKSHIFT 10 /* 1k */ 34*4d3c95f5SJorgen Lundman #define DN_MAX_INDBLKSHIFT 14 /* 16k */ 35*4d3c95f5SJorgen Lundman #define DNODE_BLOCK_SHIFT 14 /* 16k */ 36*4d3c95f5SJorgen Lundman #define DNODE_CORE_SIZE 64 /* 64 bytes for dnode sans blkptrs */ 37*4d3c95f5SJorgen Lundman #define DN_MAX_OBJECT_SHIFT 48 /* 256 trillion (zfs_fid_t limit) */ 38*4d3c95f5SJorgen Lundman #define DN_MAX_OFFSET_SHIFT 64 /* 2^64 bytes in a dnode */ 39*4d3c95f5SJorgen Lundman 40*4d3c95f5SJorgen Lundman /* 41*4d3c95f5SJorgen Lundman * Derived constants. 42*4d3c95f5SJorgen Lundman */ 43*4d3c95f5SJorgen Lundman #define DNODE_SIZE (1 << DNODE_SHIFT) 44*4d3c95f5SJorgen Lundman #define DN_MAX_NBLKPTR ((DNODE_SIZE - DNODE_CORE_SIZE) >> SPA_BLKPTRSHIFT) 45*4d3c95f5SJorgen Lundman #define DN_MAX_BONUSLEN (DNODE_SIZE - DNODE_CORE_SIZE - (1 << SPA_BLKPTRSHIFT)) 46*4d3c95f5SJorgen Lundman #define DN_MAX_OBJECT (1ULL << DN_MAX_OBJECT_SHIFT) 47*4d3c95f5SJorgen Lundman 48*4d3c95f5SJorgen Lundman #define DNODES_PER_BLOCK_SHIFT (DNODE_BLOCK_SHIFT - DNODE_SHIFT) 49*4d3c95f5SJorgen Lundman #define DNODES_PER_BLOCK (1ULL << DNODES_PER_BLOCK_SHIFT) 50*4d3c95f5SJorgen Lundman #define DNODES_PER_LEVEL_SHIFT (DN_MAX_INDBLKSHIFT - SPA_BLKPTRSHIFT) 51*4d3c95f5SJorgen Lundman 52*4d3c95f5SJorgen Lundman #define DNODE_FLAG_SPILL_BLKPTR (1<<2) 53*4d3c95f5SJorgen Lundman 54*4d3c95f5SJorgen Lundman #define DN_BONUS(dnp) ((void *)((dnp)->dn_bonus + \ 55*4d3c95f5SJorgen Lundman (((dnp)->dn_nblkptr - 1) * sizeof(blkptr_t)))) 56*4d3c95f5SJorgen Lundman 57*4d3c95f5SJorgen Lundman typedef struct dnode_phys { 58*4d3c95f5SJorgen Lundman uint8_t dn_type; /* dmu_object_type_t */ 59*4d3c95f5SJorgen Lundman uint8_t dn_indblkshift; /* ln2(indirect block size) */ 60*4d3c95f5SJorgen Lundman uint8_t dn_nlevels; /* 1=dn_blkptr->data blocks */ 61*4d3c95f5SJorgen Lundman uint8_t dn_nblkptr; /* length of dn_blkptr */ 62*4d3c95f5SJorgen Lundman uint8_t dn_bonustype; /* type of data in bonus buffer */ 63*4d3c95f5SJorgen Lundman uint8_t dn_checksum; /* ZIO_CHECKSUM type */ 64*4d3c95f5SJorgen Lundman uint8_t dn_compress; /* ZIO_COMPRESS type */ 65*4d3c95f5SJorgen Lundman uint8_t dn_flags; /* DNODE_FLAG_* */ 66*4d3c95f5SJorgen Lundman uint16_t dn_datablkszsec; /* data block size in 512b sectors */ 67*4d3c95f5SJorgen Lundman uint16_t dn_bonuslen; /* length of dn_bonus */ 68*4d3c95f5SJorgen Lundman uint8_t dn_pad2[4]; 69*4d3c95f5SJorgen Lundman 70*4d3c95f5SJorgen Lundman /* accounting is protected by dn_dirty_mtx */ 71*4d3c95f5SJorgen Lundman uint64_t dn_maxblkid; /* largest allocated block ID */ 72*4d3c95f5SJorgen Lundman uint64_t dn_used; /* bytes (or sectors) of disk space */ 73*4d3c95f5SJorgen Lundman 74*4d3c95f5SJorgen Lundman uint64_t dn_pad3[4]; 75*4d3c95f5SJorgen Lundman 76*4d3c95f5SJorgen Lundman blkptr_t dn_blkptr[1]; 77*4d3c95f5SJorgen Lundman uint8_t dn_bonus[DN_MAX_BONUSLEN - sizeof(blkptr_t)]; 78*4d3c95f5SJorgen Lundman blkptr_t dn_spill; 79*4d3c95f5SJorgen Lundman } dnode_phys_t; 80*4d3c95f5SJorgen Lundman 81*4d3c95f5SJorgen Lundman #endif /* _SYS_DNODE_H */ 82